I'm repairing a Sony TA-F550ES amplifier from the early 90s that had some intermittent sound issues.

TA-F550ES Service Manual: https://elektrotanya.com/sony_ta-f550es.pdf/download.html

I replaced the original Omron G5R-2232P protection relays with the currently available equivalent Omron G2RG-2A4 24VDC type which can be purchased from many electronics parts stores.

TIME STAMPS: 0:00 Introduction 2:21 A Look inside 6:49 Setting the Idling Current 10:48 Troubleshooting 13:39 Disassembly 22:18 Replacing the Speaker Protection Relays 26:43 Dust Removal & Reassembly 28:55 Cleaning Potentiometers & Switches 45:12 Reassembly 46:11 Final Test Run 48:32 More Cleaning & Full Reassembly 50:45 Thank you & Good night

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